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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c146524386c0ff86131efc89af34bf91ccf0bdcb7341da17bea6e873c696db35' 
  AND token = '9GeZo1PLS4xidUn31DLYf+qysL0rumbMQsHGqY9/HlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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