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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9fb2ef350f4a95197c916086cde7f6497c48a627d6f441b6a9096964b1d357' 
  AND token = 'r+2dH2ZMR83QoUgfPPwN8pv/l8wR0k/Nn+JxoKeMHH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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