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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f19ea3c02d6fd0dd55541fe43bde7a394345ff3b6bb074cac06f9502fcd7a9' 
  AND token = 'HwQjWr5g6uNaooY2KrPZ8DDOG+ksH6gDLrSEz1HOTK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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