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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd2ceb972ff0a26c48a38a9258584a2edc9776b3cf1dd8aa94ceb1999566b61' 
  AND token = 'X1lZdgbO6wQO0zddNblQ6LX03C+0T/r+XqdYymueV5c=' 
  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"
    }
  }
}