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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b3a8aa7a5848af09fcb9463d26e0eb3616c6301485da5fe2ff85d3064e5a6e' 
  AND token = 'UQ2Bx3+bJuWn7O7LxI4ZCYcnk8RskYV2M2BttHrQMqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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