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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f2fb34f83c265b3cabd4846ac2042303554d91c7bd92bbc30247eb7bb0c8bd' 
  AND token = 'qcGqGUeGm5HEFxoAiMd2uumaJacyXGY6f8HkO+ODz4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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