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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03549b68c048e49f05c6089f14ead33fc420918bbcefb4ad7d18ffbd23b908c1' 
  AND token = 'HtU8X6RsZ0loPd3wMFoQHpgyyxY/Cm5iQIP8N7q8U/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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