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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb20a9a46bda13c4c176130e3f02909e1b26642aaa2a00a80a8fdd929aefe12a' 
  AND token = 'SZ5xdpd1eys9T+7JysFTfWqaMgLhD8QL0wr4Dk7HWUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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