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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d126f434a2509dd22eda06e9939a2f2bb1893d8deb8c6ce74224d7d3949b23' 
  AND token = 'CloqwmdmKDMxU0vt7ixf2a+DNhWdcDH/tDBCmPqn4Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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