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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7ee802990d31d5074db6f948c384a2c170362b63eb707c3feb550ca2755e97' 
  AND token = 'Q28AlAdDNjBWBUD9iOFBq0ihARLUm+aHax8EYZO74hA=' 
  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"
    }
  }
}