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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9c1431c3bcad90c0c54a1ec4855135c2519b88e273b10f297c3bf9a8e268bb' 
  AND token = '52i6Kkf+F9WCNaOTjNZT3q/cg0bjct0u9TH1uPJDdu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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