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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0f7b428b94b4a5412468285fc7af50550bf4266ce2c181b4cb21c8c358776a' 
  AND token = 'k36bhiV9pHOY0kzrEYPfkcuxYINErMhSchPiNixJsIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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