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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8848b0b60f70f11718dcdb95a3b9b2f6d03d81fdbedefc102adc53de0083a588' 
  AND token = 'erDoFGJbZ+4j0D/gO1H2MWKbrEGA4ia3TDANZJtQgBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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