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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c9334cdb37dd04695d9b2be6bd78646e2162060eb36c62e40cc3b732eb32cf' 
  AND token = 'exXOujsDDrGyRN+S7At+ciYyK0rHcTn8VJZR1RNLKgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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