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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20974724c719937269c0435725f22fe028369ace92125d0e5652a89660161a9' 
  AND token = 'sQ7qTFJd6FZQ2vSA7XJ/4Zmso7KZGeO8gHkUAe5CMXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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