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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62103792ddd5750ea4cce7f983477d818411df5bc00d379c0647e137c7b9417' 
  AND token = 'X4xpnZbrYbVlIG6XinZ55PEHchlwO0/rOsT1r4ZiKXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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