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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47afd6733a34455e9accb69a77929826f35c45d67dfb15c669ad856dcd979181' 
  AND token = 'aZtl6Fco9e4L+oTE4ZOMEx0VyKKXCELZA/sof39XpHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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