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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f3bf8bebc0ab9be6c61dacaf033fb1db2bb7b0b9914516d91394318c92580c' 
  AND token = 'DQpVDH+IChu3k78Sv133OhsBoq6AD7mXRK4/3rZkn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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