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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74ce19635c012bf82e2e80872c78c0cd8fe536436ab2748fb342a3fb763a7c3' 
  AND token = 'qkKlwZD4RDraxMkRHq6YzCKqItFBY21J726RMdU8+N4=' 
  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"
    }
  }
}