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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4f0990e2ffd8cd8e691438ceefa635cbfadd102b0b30a4e51b82dd4a5aba8b' 
  AND token = 'hPoiqEdjbX6yK11ZvkLsO2w+RXT5mJjbB/aaby3ZlU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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