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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8142fc15e60a3f0e36b78f36726bde597cef63f6f9cf6b202a64a605ed2bf7' 
  AND token = 'AmgVL+QDJiYYuS/mqiIVW2UwifIG7EcunqbVSPDSauk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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