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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5941d502dd318781251c8b3c56153493506b7ea6289bbb3ea67964a6564d6703' 
  AND token = 'mcaSqgv2/U0ZUZbVzoca31aqS5ehdMFT3BBIIfc2MB0=' 
  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"
    }
  }
}