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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d629b3e1d9f1328ca2b96c9bcc8a45ddbec85d1a5ac28dd2e472e410a6742b5' 
  AND token = 'jrNC1EFO4Sufx0m/UBdeldzAn7pUWOdETldSDesAZI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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