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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19cb772e69cb8708c14b46bd0ced829ce66c6b964b51b128e8571d2c98b7ec6' 
  AND token = 'tpNmfOfeScBp8mcPxJoA7m+kD+j/o+8UlYyWxrrtwSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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