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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6cb5005dc865b84d34b435c4c877b30f24cbee137fd57a2d05580a42e29809' 
  AND token = 'wA2+Y7FvIggvof5Idl/59O84lcMH17D9LS9gub9D3Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}