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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b228b7009d005c5a223a5faf75b09d203889cf8f46609212da2ebf9b1c1f7731' 
  AND token = '7HJfOw/ak0sTB1ufG8IZ1g+pj2KjWAnUdAIOv3RsK3s=' 
  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"
    }
  }
}