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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3235b4dd8cb3ec6d7f552fb9983eb7c9750950320cbcea1ba884d2279ccc945' 
  AND token = 'fvMTg8t1ETKV4CPkztL5E4S/P1IdQtAMaaSw0WIODGE=' 
  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"
    }
  }
}