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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f34f50d00d9d433814eca7ad76a772cf8425b58f7a0268c0083900452d252ce' 
  AND token = 'U90d+SYeRhJIpqJ4oq1hYwoUIv+fb8xl8DVFSfRovXY=' 
  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"
    }
  }
}