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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa25c9d7926389162db9250df50e6ce60689ecd0c2b53a6bfa3c0360703b859' 
  AND token = 'KuhvdKw7Ftf1W3g4eZDvUe1uLLGh6t/EzmYsuOxV4c0=' 
  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"
    }
  }
}