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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb483305bfa66b260e7f19fcb529057153b2acf2b4fdeb096e401930d2bfc5c' 
  AND token = 'd7prl8tsi0T+Lc6KwSa7UzzfNhJSgrQtU77v5i5FxpA=' 
  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"
    }
  }
}