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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eb73becde9b2d26dd45e1e0407045a523528c969749b8a33d3131cec3676e0' 
  AND token = 'vNZhuCkDF9IHinuUBmVE4M7EO5qf0fH4HLAa2SKh/l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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