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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ca882a5ec9340fff926c6601da3e2dba34cfb65dfee834bb9d98d7be921f0f' 
  AND token = 'H8F4AThE+5h7Dk65ppSknBdhYm5tFoHS9KU7np0/swo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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